Fuel Pump (FP) Control Module J538 , checking (vehicles with 4-cyl. TFSI engine)

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Special Tools - Fuel Pump (FP) Control Module J538 , Checking (Vehicles With 4-Cyl. TFSI Engine)

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Special tools, testers and auxiliary items required

Portable multimeter V.A.G 1526 B
Connector test set V.A.G 1594 C
Adapter cable V.A.G 1598/39
Test box V.A.G 1598/42

Test conditions

Battery voltage at least 12.5 V.

Fig 2: Identifying Main Fuse Panel

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fuse on fuse panel S228 (position 28) OK.
Ignition switched off.

Check voltage supply for Fuel Pump (FP) (from Fuel Pump (FP) Control Module J538)

Remove rear seat bench →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET
.

Fig 3: Removing Cover Bolts For Locking Flange

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Unbolt cover for right locking flange - arrows -.
Fold protective boot back.

Fig 4: Connecting Hand Multimeter V.A.G 1526 B With Measuring Probes And Connector Adapters From Connector Test Set V.A.G 1594 C Or V.A.G 1594 A Between Clamp

Courtesy of VOLKSWAGEN UNITED STATES, INC.

For voltage testing, connect the hand multimeter V.A.G 1526 B with measuring probes and connector adapters from the connector test set V.A.G 1594 C or V.A.G 1594 A between clamp - 1 - and - 4 - , as shown in illustration. The electrical connection remains connected.

NOTE:

Connector sockets are numbered respectively on the rear side of the connector.

Start engine.

Specified value during start and while running at idle: 4 to 5.7 V.

Depress accelerator pedal completely and then release it (brief throttle burst).

Specification: The voltage value must first rise slightly, then fall and then rise again to the previously read value.

If the reading does not result as described:

Check voltage supply and activation of Fuel Pump (FP) Control Module J538.

Check voltage supply for Fuel Pump (FP) Control Module J538

Remove Fuel Pump (FP) Control Module J538 → Fuel Pump (FP) Control Module J538 , removing and installing .

Fig 5: Identifying Fuel Pump (FP) Control Module J538

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Disconnect electrical harness connector - arrow - on Fuel Pump (FP) Control Module J538.

Fig 6: Identifying Engine Control Module (ECM) 5-pin Connector Terminals 1 & 5

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Connect multimeter between terminal - 3 - and - 4 - of harness connector for voltage measurement.
Switch ignition on.

Specification: approx. battery voltage.

If specification is not obtained:

Repair open circuit in wiring according to wiring diagram.

Check activation of Fuel Pump (FP) Control Module J538

Remove protective cap.

Fig 7: Connecting Multimeter With Measuring Probes And Connector Adapters From Connector Test Set V.A.G 1594 C Between Clamp

Courtesy of VOLKSWAGEN UNITED STATES, INC.

For voltage testing, connect the multimeter with measuring probes and connector adapters from the connector test set V.A.G 1594 C between clamp - 4 - and - 5 - , as shown in illustration. The electrical connection remains connected.

NOTE:

Connector sockets are numbered respectively on the rear side of the connector.

Start engine.

Specified value during start and while running at idle: approx. 5.0 V.

Depress accelerator pedal completely and then release it (brief throttle burst).

Specification: The voltage value must first rise slightly, then fall and then rise again to the previously read value.

If the reading does not result as described:

Switch off ignition.

Fig 8: Connecting Test Box V.A.G 1598/42 To Wiring Harness With Adapter Cable V.A.G 1598/39-1 Or Adapter Cable V.A.G 1598/39-2

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Connect test box V.A.G 1598/42 to wiring harness with adapter cable V.A.G 1598/39-1 or adapter cable V.A.G 1598/39-2 ; engine control module (ECM) remains connected. Clamp test box Ground (GND) clip to battery negative terminal →
- 24 MULTIPORT FUEL INJECTION (MFI) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMB
- 24 - MULTIPORT FUEL INJECTION (MFI) for 2.0 LITER 4-CYL. 4V TURBO FUEL INJECTION IGNITION, ENGINE CODE(S): BPG, BWT
- 24 MULTIPORT FUEL INJECTION (MFI) for 3.0 LITER 6-CYL. 5V FUEL INJECTION & IGNITION, ENGINE CODE(S): AVK, BGN
- 24 - FUEL INJECTION SYSTEM for 3.2 V6 4V FUEL INJECTION IGNITION, ENGINE CODE(S): BKH
- 24 - MULTIPORT FUEL INJECTION (MFI) for 4.2 LITER V8 4V FUEL INJECTION AND IGNITION, ENGINE CODE(S): BNS
- 24 MULTIPORT FUEL INJECTION (MFI) for 4.2 LITER V8 5V FUEL INJECTION AND IGNITION, ENGINE CODE(S): BHF
.

CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.

Fig 9: Identifying Engine Control Module (ECM) 5-pin Connector Terminals 1 & 5

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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:

Harness connector Terminal	Test box V.A.G 1598/42 Socket
- 5 -	B 27

Repair wiring open circuit or short circuit according to wiring diagram.

If no malfunctions are detected:

Replace Fuel Pump (FP) Control Module J538.